· Web viewPDS 2010 Parylene Coater SOP Scope This document provides the procedures and requirements to deposit a parylene film, using the Specialty Coating Systems PDS 2010 Parylene

PDS 2010 Parylene Coater SOP Page 1 of 12Revision 2-011812

PDS 2010 Parylene Coater SOP

1. Scope

1.1 This document provides the procedures and requirements to deposit a parylene film, using the Specialty Coating Systems PDS 2010 Parylene Coater.

2. Table of Contents1. Scope...........................................................................................................................................................12. Table of Contents........................................................................................................................................13. Reference Documents.................................................................................................................................2

3.1 Referenced within this Document.........................................................................................................23.2 External Documents..............................................................................................................................2

4. Equipment and/or Materials.......................................................................................................................25. Safety...........................................................................................................................................................36. Setup Procedures........................................................................................................................................3

6.1 Prepare Samples...................................................................................................................................36.2 Enable Coater........................................................................................................................................36.3 Vent Chamber.......................................................................................................................................36.4 Make Dimer Boat..................................................................................................................................46.5 Weigh Dimer.........................................................................................................................................46.6 Load Dimer............................................................................................................................................4

6.6.8 Check Pump Oil Level...................................................................................................................56.7 Obtain Liquid Nitrogen..........................................................................................................................56.8 Clean Cold Trap Thimble.......................................................................................................................5

7. Parylene Deposition Procedures..................................................................................................................67.1 Open Chamber......................................................................................................................................67.2 Inspect Components.............................................................................................................................67.3 Load Samples/Parts...............................................................................................................................67.4 Check Baffle Installation........................................................................................................................67.5 Install Loading Fixture...........................................................................................................................67.6 Replace Chamber Lid.............................................................................................................................67.7 Start Process Cycle................................................................................................................................77.8 Add Liquid Nitrogen..............................................................................................................................77.9 Monitor System.....................................................................................................................................7

7.9.3 Alarms..........................................................................................................................................77.10 Stop Process..........................................................................................................................................77.11 Vent Chamber.......................................................................................................................................77.12 Unload Chamber...................................................................................................................................77.13 Clean Cold Trap Thimble.......................................................................................................................87.14 Remove Dimer Boat..............................................................................................................................87.15 Measure Film Thickness........................................................................................................................87.16 System Standby.....................................................................................................................................87.17 Disable Coater.......................................................................................................................................9

8. Supplemental Procedures............................................................................................................................9

Chamber Lid

Chamber

Front Panel Door

Control Panel

Figure , Parylene Coater


8.1 System Start-up.....................................................................................................................................98.2 Mixing Microsoap Spray........................................................................................................................98.3 Adhesion Promotion (Silane Coating)....................................................................................................9

8.3.1 Mix the Adhesion Promotion Solution.........................................................................................98.3.2 Verify Solution............................................................................................................................108.3.3 Preparing Sample.......................................................................................................................10

9. Process Notes............................................................................................................................................109.1 Alarm Codes........................................................................................................................................10

10. Revision History.........................................................................................................................................11

Figure 1, Parylene Coater.........................................................................................................................................2Figure 2, Coater Control Panel..................................................................................................................................3Figure 3, Make Dimer Boat.......................................................................................................................................4Figure 4, Vaporizer and Vacuum Pump....................................................................................................................5Figure 5, Cold Trap....................................................................................................................................................5Figure 6, Removing Loading Fixture..........................................................................................................................6Figure 7, Chamber Interior.......................................................................................................................................6

3. Reference Documents

3.1 Referenced within this Document

3.1.1 None

3.2 External Documents

3.2.1 None

4. Equipment and/or Materials

4.1 SCS PDS 2010 Parylene Coater (see Error: Reference source not found)

4.2 Aluminum Foil

4.3 Parylene Dimer DPX-C

4.4 A-174™ Adhesion Promoter (Silane coating)

4.5 Isopropyl Alcohol, 99%

4.6 Potassium Permanganate

4.7 Pipette

4.8 100 ml Beaker

4.9 Boat Form

4.10 Micro-90® Cleaning Fluid

4.11 D.I. Water

4.12 Liquid Nitrogen

4.13 Liquid Nitrogen Dewar, 4 liter capacity


4.14 Cryogenic Gloves

5. Safety

5.1 Follow all Nanofab safety procedures.

5.2 The use of razor blades is necessary to remove film coating from component surfaces.

5.2.1 Exercise extreme caution when using razor blades to prevent cuts and lacerations.

5.2.2 Never leave or store uncovered razor blades anywhere within the lab.

5.2.3 Discard razor blades only in designated “sharps” disposal bins.

6. Setup Procedures

6.1 Prepare Samples

6.1.1 Prepare samples prior to Parylene deposition as needed.

NOTE: Some samples may need to be treated with an adhesion promoter. When this is necessary, follow the procedures in section 8.3, Adhesion Promotion (Silane Coating).

6.2 Enable Coater

6.2.1 In Coral, enable the coater and complete all required data entry.

NOTE: Enabling the coater will release the interlock and activate the PROCESS START/STOP button.

6.3 Vent Chamber

6.3.1 Move the Vacuum switch to VENT (see Error: Reference source not found).

Emergency Stop Button

Main Power Button

Process Start/Stop Button

Furnace Temperature ControllerChamber Gauge Temperature ControllerVaporizer Temperature ControllerVacuum Pressure Controller

Alarm Button

Furnace / Chamber Gauge SwitchVaporizer Switch Vacuum Switch

Figure , Coater Control Panel


Place boat form on aluminum foil

Shape foil around form. Close ends.

Remove boat form. Ensure boat ≤ 7.5” long.

Figure , Make Dimer Boat


6.4 Make Dimer Boat

6.4.1 Cut a rectangular piece of aluminum foil 11” by 5”.

6.4.2 Place the foil piece on a flat surface with the shiny side up.

6.4.3 Get the boat form from its storage location.

6.4.4 Place the boat form lengthwise at the center of the foil piece (see Error: Reference source not found).

6.4.5 Roll the foil piece onto the boat form.

6.4.5.1 The foil should not extend beyond a half-circle.

6.4.6 Fold up the ends of the foil.

6.4.6.1 Keep the length of the boat between 7 – 7.5”.

WARNINGThe length of the dimer boat should not exceed 7.5” or the process may

be affected.

6.4.7 Remove the foil from the boat form.

6.4.8 Return the boat form to its storage location.

6.5 Weigh Dimer

6.5.1 Place the empty dimer boat on a digital scale.

6.5.2 Zero the scale.

6.5.3 Placing the dimer into the boat, load the desired amount of dimer.

NOTE: 1 gram of dimer will provide a coating layer approximately 0.6 µm (600 nm) thick.

WARNINGNever exceed 125 grams of dimer.

6.5.4 Record the dimer weight in Coral.

6.6 Load Dimer

6.6.1 Check the temperature of the vaporizer.

6.6.2 If the temperature is greater than 40°C, DO NOT PROCEED.

6.6.2.1 Wait until the temperature is below 40°C.

Vaporizer Door Latch

Vaporizer Door Vacuum Pump

Vacuum Pump Oil Sight Glass

Figure , Vaporizer and Vacuum Pump

Cold Trap Housing

Cold Trap Thimble

Cold Trap Thimble Holder

Figure , Cold Trap


WARNINGIf the vaporizer temperature is above 40°C, the dimer will begin to vaporize.

6.6.3 Open the front door of the coater (see Error: Reference source not found).

6.6.4 Release the latch for the vaporizer door (see Error: Reference source not found).

6.6.5 Open the vaporizer door.

6.6.6 Insert the loaded dimer boat into the vaporizer.

NOTE: Insert the boat only far enough to close the vaporizer door. This is necessary to prevent premature vaporization of the dimer.

6.6.7 Close and latch the vaporizer door.

6.6.8 Check Pump Oil Level

6.6.8.1 Looking at the Vacuum Pump Oil Sight Glass, ensure the pump oil level is between the low and high fill marks (1 – 7 on the scale).

6.6.8.2 Record the oil level in Coral.

6.6.8.3 If the oil level is not between the marks, contact the lab staff. Do NOT proceed.

6.6.9 Close the front door of the coater.

6.7 Obtain Liquid Nitrogen

6.7.1 Obtain the liquid nitrogen dewar.

6.7.2 Using thermal gloves, fill the dewar with liquid nitrogen.

6.8 Clean Cold Trap Thimble

6.8.1 Remove the cold trap thimble from the cold trap housing (see Error: Reference source not found).

6.8.2 Place cold trap thimble in the holder.

6.8.3 Using a razor blade, gently scrape the surface of the cold trap thimble to remove any build up.

6.8.4 Wipe the surface with a clean room wipe.

6.8.5 Spray the surface of the cold trap thimble with the Microsoap solution.

6.8.6 Using a clean room wipe, spread the Microsoap solution evenly across the surface of the cold trap thimble.

Loading Fixture

Figure , Removing Loading Fixture

Baffle

Turntable

Figure , Chamber Interior


6.8.7 Place the cold trap thimble in the cold trap housing.

7. Parylene Deposition Procedures

7.1 Open Chamber

7.1.1 After the chamber has been vented, remove the lid from the chamber.

7.1.2 Carefully place the lid with the handles on the loading table.

NOTE: Scratches on the interior surface will prevent a good vacuum seal.

7.1.3 Remove the loading fixture from the chamber (see Error: Reference source not found).

7.2 Inspect Components

7.2.1 Visually inspect the surface of the chamber, baffle, lid, and loading fixture.

7.2.1.1 If any peeling, blistering, or flaking is seen, contact the lab staff for cleaning instructions.

7.3 Load Samples/Parts

7.3.1 Load the samples/parts onto the loading fixture.

7.3.1.1 Each of the three levels may be used.

7.3.1.2 Additional test samples may be necessary to measure deposited film thickness.

NOTE: Multiple samples/parts may be loaded on each level, with a minimum spacing of ½”.

7.4 Check Baffle Installation

7.4.1 Ensure the baffle is installed with the holes facing the chamber wall (see Error: Reference source not found.

7.5 Install Loading Fixture

7.5.1 Place the loading fixture at the center of the turntable.

7.5.2 Ensure the fixture does not touch the baffle.

NOTE: There should be approximately ¼” between the baffle and the fixture.

7.6 Replace Chamber Lid

7.6.1 Carefully place the chamber lid on top of the chamber.

7.6.2 Ensure the lid rests evenly on the chamber.


7.7 Start Process Cycle

7.7.1 Press the green PROCESS START/STOP button.

7.7.2 Move the Furnace/Chamber Gauge switch to ENABLE.

7.7.3 Move the Vaporizer switch to ENABLE.

7.7.4 Move the Vacuum switch to VACUUM.

7.8 Add Liquid Nitrogen

7.8.1 Add liquid nitrogen to the cold trap thimble until it nearly reaches to top of the thimble.

7.9 Monitor System

7.9.1 Monitor the level of liquid nitrogen throughout the process cycle.

7.9.1.1 Add liquid nitrogen as necessary to keep the level within 3” of the top of the cold trap thimble.

7.9.2 Wait for the process to complete.

NOTE: The PROCESS START/STOP button will flash green when the process is completed.

7.9.3 Alarms

NOTE: An alarm can occur during deposition only. An audio alarm will sound and the red alarm button will flash a sequence every 5 seconds (see Error: Reference source not found). If the problem is not corrected within 5 minutes, the deposition cycle will be automatically aborted.

7.9.3.1 To silence the alarm, push the red alarm button.

7.9.3.2 Count the number of times the red alarm button flashes within the 5 second sequence.

7.9.3.3 Notify the lab staff of the alarm and the number of flashes.

7.10 Stop Process

7.10.1 Press flashing PROCESS START/STOP switch.

7.10.2 Move the Furnace/Chamber Gauge switch to DISABLE.

7.10.3 Move the Vaporizer switch to DISABLE.

7.11 Vent Chamber

7.11.1 Move the Vacuum switch to VENT.

7.11.2 Wait for the chamber to vent.

NOTE: The Vacuum Pressure Controller will display approximately “980”.

7.12 Unload Chamber

7.12.1 Remove the lid from the chamber.

7.12.2 Carefully place the lid with the handles on the loading table.

NOTE: Scratches on the interior surface will prevent a good vacuum seal.

7.12.3 Remove the loading fixture from the chamber.


7.12.4 Remove the samples/parts from the loading fixture.

7.12.5 Visually inspect the surface of the chamber, baffle, lid, and loading fixture.

7.12.5.1 If any peeling, blistering, or flaking is seen, contact the lab staff for cleaning instructions.

7.13 Clean Cold Trap Thimble

7.13.1 Remove the cold trap thimble from the housing.

7.13.2 Place the cold trap thimble in the holder.

7.13.3 Wait for all the residual liquid nitrogen to evaporate.

7.13.4 Wait for the frost to melt from the cold trap thimble.

7.13.5 Using a razor blade, gently scrape the surface of the cold trap thimble to remove any build up.

7.13.6 Wipe the surface with a clean room wipe.

7.13.7 Place the cold trap thimble in the housing.

7.14 Remove Dimer Boat

7.14.1 Open the front door of the coater.

7.14.2 Release the latch for the vaporizer door.

7.14.3 Open the vaporizer door.

7.14.4 Remove the empty dimer boat from the vaporizer.

7.14.5 Discard the empty dimer boat.

7.14.6 Close and latch the vaporizer door.

7.14.7 Close the front door of the coater.

7.15 Measure Film Thickness

7.15.1 Measure the thickness of the deposited film.

NOTE: This will normally be done using a profilometer.

7.16 System Standby

7.16.1 Place the loading fixture in the process chamber.

7.16.2 Carefully place the chamber lid on top of the chamber.

7.16.3 Ensure the lid rests evenly on the chamber.

7.16.4 Move the Vacuum switch to VACUUM.

7.16.5 Wait for the pressure to reach 100 mTorr or less.

7.16.6 Move the Vacuum switch to HOLD.


7.17 Disable Coater

7.17.1 In Coral, disable the coater and complete all data entry, including process measurement data.

NOTE: Disabling the coater will activate the interlock and disable the PROCESS START/STOP button.

8. Supplemental Procedures

8.1 System Start-up

NOTE: Follow these procedures only if the tool has been powered down.

8.1.1 Release the Emergency Stop button by turning it clockwise, or pulling it out (see Error: Reference source not found).

8.1.2 Press the white Main Power button.

8.1.2.1 The computer will initialize and the vacuum and temperature controllers will illuminate.

8.2 Mixing Microsoap Spray

NOTE: These procedures are only necessary when more Microsoap spray is needed.

8.2.1 Pour 15 ml of Micro-90® Cleaning Fluid into an empty spray bottle.

8.2.2 Add 660 ml (22 fluid ounces) of de-ionized water.

8.2.3 Close bottle.

8.2.4 Shake the bottle for approximately 30 seconds to thoroughly mix the solution.

8.3 Adhesion Promotion (Silane Coating)

NOTE: This procedure is optional to improve adhesion of the parylene to the substrate. It is not normally necessary.

8.3.1 Mix the Adhesion Promotion Solution

NOTE: The Adhesion Promotion Solution is a mixture of DI Water, 99% Isopropyl Alcohol (IPA), and A-174™. The ratio is 100:100:1 (DI Water : IPA : A-174™).

8.3.1.1 Locate a container and determine the total chemical volume needed to fully immerse the samples (for example, 200 ml total).

8.3.1.2 Divide the total volume by 2 to calculate the amount of DI water and 99% Isopropyl Alcohol (IPA) to use (for example, 100 ml each).

8.3.1.3 Divide the total volume by 200 to calculate the amount of A-174™ Adhesion Promoter to use (for example, 1 ml).

8.3.1.4 Add the DI water (½ the total volume) to the container.

8.3.1.5 Add the IPA (½ the total volume) to the container.

8.3.1.6 Add the A-174™ Adhesion Promoter ( the total volume) to the container.

8.3.1.7 Thoroughly stir the solution for a minimum of 30 seconds.

8.3.1.8 Wait a minimum of 2 hours before using the solution.


8.3.1.9 Use the solution within 24 hours of mixing (paragraph 8.3.1.7).

8.3.1.9.1 If the solution is not used within 24 hours, it will not be effective and must be discarded (as a solvent).

8.3.2 Verify Solution

8.3.2.1 Using a pipette, place 6-10 ml of the mixed solution into a clean, dry 100 ml beaker.

8.3.2.2 Carefully add 3-4 grains of potassium permanganate to the beaker.

8.3.2.3 Gently swirl the beaker contents for 15-30 seconds.

8.3.2.3.1 Do NOT mix the contents in any other way.

8.3.2.4 Observe the color of the contents.

8.3.2.4.1 If the contents turn a yellow-brown color, the adhesion promotion solution is acceptable and may be used.

8.3.2.4.2 If the contents turn a bright pink color, the adhesion promotion solution is bad and must be discarded.

8.3.2.5 Discard the pipette.

8.3.2.6 Discard the contents as a solvent.

8.3.2.7 Thoroughly rinse the beaker with IPA.

8.3.3 Preparing Sample

8.3.3.1 Submerge the samples for 30 ± 5 minutes in the adhesion promotion solution.

8.3.3.2 Remove the samples from the solution.

8.3.3.3 Allow the samples to air dry for 30 ± 5 minutes.

8.3.3.4 Submerge the samples in IPA.

8.3.3.5 Agitate the samples for 30 ± 5 seconds.

8.3.3.6 Remove the samples from the IPA, allowing the chemical to drain from the sample (45 ± 15 seconds).

8.3.3.7 Ensure the samples are completely dry before placing on the loading fixture.

8.3.3.7.1 If the samples are not coated with parylene within 30 hours, repeat 8.3.3.

8.3.3.8 Discard the IPA.

9. Process Notes

9.1 Alarm Codes

Code Number (Flashes) Cause

1 Vaporizer temperature too high2 Gauge tube temperature out of range3 Furnace temperature out of range


10. Revision History

Rev Date Originator Description of Changes

1 14 Sep 2009 Tony Olsen Initial Release.2 18 Jan 2012 Tony Olsen Replace references for log sheet to Coral. Add sections

to Enable/Disable Coral.